Everything you have described I essentially am into as well. You do serve as a worthy candidate. You are a sadist?
Sadomasochist, I like hurting others but so far no one's been open to it beyond maybe once or twice. As an Algolagniac I can't relate to pain properly so I get misleading projections over it sometimes. Seeing another in pain has my mirror neurons go off and it's... it's really damn good.
I get sadist's guilt if they look like the pain isn't fun, and it's very distracting. If they were to squirm like it's something to enjoy, more like I do, then... well, I haven't had that happen yet. Sucks to get in trouble for smiling at anothers' pain too, even when I feel bad they look so good writhing and arching their back like that.
I've been the masochist for all of my relationships, and being open to pain as a form of flirting is really nice as a bonding experience. Hair pulling in public or having my arm hit super hard from a punch at an old bruise for instance is ngh~.
I really miss it, towards the latter half of my last relationship Crow pretty much stopped hurting me entirely. The need is really, really itchy, and hitting myself isn't the same from giving me too much mental room to brace for the impact with natural limiters that make it harder to hurt myself enough to unclench and enter subspace.
Seriously, pain is such a drug. I have to remind myself that it's trying to warn me, rather than trying to show me a good time.
Ę̵̚x̸͎̾i̴͚̽s̵̻͐t̷͐ͅe̷̯͠n̴̤̚t̵̻̅i̵͉̿a̴̮͊l̵͍̂ ̴̹̕D̵̤̀e̸͓͂t̵̢͂e̴͕̓c̸̗̄t̴̗̿ï̶̪v̷̲̍é̵͔